How to run the python interpreter

How does the python interpreter run?

On machines where Python is available, the Python interpreter is usually placed in /usr/local/bin/python3.7; put /usr/local/bin in the search path of your Unix shell, In this way, you can type the command:

python3.7

and it will run. You can choose the installation directory during installation, so the interpreter may be elsewhere; you can ask the Python expert around you, or your system administrator. (For example, /usr/local/python is also a commonly used alternative path)

Enter the end-of-file character in the main prompt (Control-D in Unix systems, Control-Z in Windows systems). Exits the interpreter and returns an exit status of 0. If this doesn't work, you can also write this command to exit: quit().

The line editing function of the interpreter also includes interactive editing. On systems that support readline, you can review historical commands and also have the Tab code completion function. To quickly check whether line editing is supported, press Control-P on your keyboard when the prompt appears. If it beeps, it supports line editing; for a detailed introduction to the keys, see the appendix Interactive Editing and Edit History. If nothing happens, or ^P is displayed, line editing is not supported; you can only delete characters from the current line using the Backspace key.

The interpreter runs a bit like a Unix command line: called on a standard input tty device, it can read and execute commands interactively; provide a file name parameter when calling, or have a file redirection to standard input, it will read and execute the script in the file.

Another way to start the interpreter is python -c command [arg] ..., where command should be replaced with the instruction you want to execute, just like the -c option on the command line. Since Python code often contains characters that are special to the terminal, it is usually recommended to enclose command in English single quotes.

Some Python modules can also be used as scripts. You can enter like this: python -m module [arg] ..., which will execute the module's source file, just like you wrote the entire path on the command line.

When running a script, sometimes you may need to enter interactive mode after running. In this case, just add the option -i before the file parameters.

Related recommendations: "Python Tutorial"

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